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Tytuł:
The analysis of the effects of screening helicopter engine compartments for infrared emission
Autorzy:
Fijałkowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/102769.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
helicopter
infrared screen
infrared emission
egine gondola
Opis:
The paper presents the research on using infrared screens protecting an engine in an engine gondola in PZL W-3 helicopter to limit infrared emission to the surrounding. The methods of numerical modelling and computing simulation (hover and horizontal flight forward) were applied to the analysis. The results enabled formulating the guidelines to construct screens.
Źródło:
Advances in Science and Technology. Research Journal; 2013, 7, 17; 23-34
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensor performance and cut-off wavelength tradeoffs of III-V focal plane arrays
Autorzy:
James, Jonathan Ch.
Haran, Terence L.
Lane, Sarah E.
Powiązania:
https://bibliotekanauki.pl/articles/2204205.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
infrared focal plane arrays
III-V semiconductor infrared detector technologies
infrared sensor performance modelling
infrared sensor design
mid-wave and longwave infrared sensors
Opis:
Infrared detector technologies engineered from III-V semiconductors such as strained-layer superlattice, quantum well infrared photodetectors, and quantum dot infrared photodetectors provide additional flexibility to engineer bandgap or spectral response cut-offs compared to the historical high-performance detector technology of mercury/cadmium/telluride. The choice of detector cut-off depends upon the sensing application for which the system engineer is attempting to maximize performance within an expected ensemble of operational scenarios that define objects or targets to be detected against specific environmental backgrounds and atmospheric conditions. Sensor performance is typically characterised via one or more metrics that can be modelled or measured experimentally. In this paper, the authors will explore the impact of detector cut-off wavelength with respect to different performance metrics such as noise equivalent temperature difference and expected target detection or identification ranges using analytical models developed for several representative sensing applications encompassing a variety of terrestrial atmospheric conditions in the mid-wave and long-wave infrared wavelength bands. The authors will also report on their review of recently published literature concerning the relationships between cut-off wavelength and the other detector performance characteristics such as quantum efficiency or dark current for a variety of detector technologies.
Źródło:
Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144570
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on noise removal in infrared images
Autorzy:
Budzan, S.
Wyżgolik, R.
Powiązania:
https://bibliotekanauki.pl/articles/114180.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermography
infrared images
noise removal
Opis:
Noise removal in IR (Infra Red) images is very popular in recent years, however the same approach is utilized as for vision images, with no or minor changes. In this work we wanted to show the results of noise removal for selected filters. We focused on investigation of some filters normally used for image processing and their influence to IR image quality. In IR imaging the choice of filter depends mainly on the purpose of the processing, e.g. detection of small objects in complex images, edge and contour detection or removal of non-uniformity of the detector array. The performance of the selected noise reduction filters was evaluated using PSNR (Peak Signal-to-Noise Ratio) and MAE (Mean Absolute Error) quality measure, greater value of the PSNR and lower value of the MAE indicate better noise reduction. The results are shown only for few images from our database which contain over 2000 of IR images.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 187-190
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IR technology in marine applications
Autorzy:
Świderski, W.
Powiązania:
https://bibliotekanauki.pl/articles/359089.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
infrared radiation
marine applications
infrared technique
measuring devices
observations
Opis:
The infra-red radiation was discovered in 1800 by English astronomer Sir Wiliam Hirchel but practical appl ications could be dated to the beginning of XX century. First advanced scientific investigations, as well as works relating to the military applications of IR technique were carried out during the First World War. Many applications of IR radiation exist until now. It is generally accepted that taking into account the destination the devices of IR techniques can be divided on three main groups: measuring devices, observation and aut omatic recognition systems. Devices of this type can be found both in Navy and civil marine.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 144-148
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infrared and visible image fusion with deep wavelet-dense network
Autorzy:
Chen, Yanling
Cheng, Lianglun
Wu, Heng
Chen, Ziyang
Li, Feng
Powiązania:
https://bibliotekanauki.pl/articles/2202762.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
infrared image
image fusion
image processing
infrared image enhancement
Opis:
We propose a high-quality infrared and visible image fusion method based on a deep wavelet-dense network (WT-DenseNet). The WT-DenseNet includes three network layers, the hybrid feature extraction layer, fusion layer, and image reconstruction layer. The hybrid feature extraction layer is composed of a wavelet and dense network. The wavelet network decomposes the feature map of the visible and infrared images into low-frequency and high-frequency components, respectively. The dense network extracts the salient features. A fusion layer is designed to integrate low-frequency and salient features. Finally, the fusion images are outputted by an image reconstruction layer. The experimental results demonstrate that the proposed method can realize high-quality infrared and visible image fusions, and the performance of the proposed method is better than that of the six recently published fusion methods in terms of contrast and detail performance.
Źródło:
Optica Applicata; 2023, 53, 1; 49--64
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Magnesium Powder on the Radiation Characteristics of MTV Foil Infrared Decoys
Autorzy:
Du, J.
Guan, H.
Li, J.
Powiązania:
https://bibliotekanauki.pl/articles/358407.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
military chemistry and pyrotechnics
infrared decoys
magnesium
burning and infrared radiation characteristics
Opis:
The aim of this project was to study how the particle size and morphology of magnesium powder affect the burning and infrared radiation characteristics of foil-type Mg/PTFE/Viton (MTV) infrared decoys. A long-wavelength thermal imager and an OPAG33 Fourier transform infrared remote-sensing spectrometer were used to characterize the burning and infrared radiation. The results show that the burning rate, burning temperature, and far-infrared radiation intensity of the decoys are improved significantly with decreased particle size. The burning rate, burning temperature, and far-infrared radiation intensity of the flake-like powder are higher than for the spherical powder of the same particle size.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 4; 855-863
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of tracking of HAZ properties based on sequence of infrared images
Autorzy:
Fidali, M.
Powiązania:
https://bibliotekanauki.pl/articles/114361.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
infrared imagining
welding monitoring
image processing
Opis:
Arc welding is commonly applied in industry. Assessment of the quality of welded joints is one of crucial tasks especially in automated applications. In the paper preliminary research devoted to the evaluation of Heat Affected Zone (HAZ) properties using method of tracking of defined Region of Interest (ROI) on infrared images continuously acquired during welding process. The proposed method can be useful to detection of welding instabilities as well as welded joint defects.
Źródło:
Measurement Automation Monitoring; 2017, 63, 4; 143-145
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compression of high dynamic infrared image using auto aggregation algorithm
Autorzy:
Fidali, M.
Jamrozik, W.
Powiązania:
https://bibliotekanauki.pl/articles/114701.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
infrared image
compression
enhancement
high dynamic
Opis:
The article presents a method of compression of High Dynamic Range of infrared image and its details enhancement. The method is based on aggregation of partial images with different ranges of pixel values generated using a weighting function. Aggregation of images could be performed according to proposed scheme with use of the optimal algorithm selected by user. Preliminary results shown that the method can reveal previously hidden details in the original image.
Źródło:
Measurement Automation Monitoring; 2017, 63, 4; 146-149
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Grating-free high-x InP/InxGa1-xAs mid-wavelength infrared QWIP focal plane array
Autorzy:
Besikci, Cengiz
Balcı, Saadettin V.
Tanış, Onur
Güngör, Oğuz O.
Arpaguş, Esra S.
Powiązania:
https://bibliotekanauki.pl/articles/2204209.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
infrared imaging
quantum well
infrared photodetector
Opis:
The authors report the characteristics of a diffraction-grating-free mid-wavelength infrared InP/In₀.₈₅Ga₀.₁₅As quantum well infrared photodetector focal plane array with a 640 × 512 format and a 15 µm pitch. Combination of a normal incident radiation sensing ability of the high-x InxGa1-xAs quantum wells with a large gain property of the InP barriers led to a diffraction-grating-free quantum well infrared photodetector focal plane array with characteristics displaying great promise to keep the status of the quantum well infrared photodetector as a robust member of the new generation thermal imaging sensor family. The focal plane array exhibited excellent uniformity with noise equivalent temperature difference nonuniformity as low as 10% and a mean noise equivalent temperature difference below 20 mK with f/2 optics at 78 K in the absence of grating. Elimination of the diffraction-grating and large enough conversion efficiency (as high as ~70% at a -3.5 V bias voltage) abolish the bottlenecks of the quantum well infrared photodetector technology for the new generation very small-pitch focal plane arrays.
Źródło:
Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144563
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Detector Characteristic on the Result of Sky Temperature Measurement with the Use of Long-Wave Infrared Camera
Autorzy:
Kruczek, T.
Powiązania:
https://bibliotekanauki.pl/articles/114666.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermovision infrared measurements
sky thermal radiation
sky temperature
characteristic of infrared camera detector
Opis:
During the temperature measurements by means of infrared camera the temperature of surrounding elements must be known. In the case of thermovision inspections of the objects exposed to open air space, the surroundings consists of two elements, it is the ground and hypothetical sky surface. The sky temperature measured by long-wave IR camera is of apparent character because it expresses the thermal radiation of the sky within the spectral operational range of this camera i.e. 7.5÷13 μm. The abovementioned spectral range is coincident with so called atmospheric window within which the thermal radiation of the sky is relatively low. The emissivity of atmosphere within this window is low in the central part and high near the limits of the aforementioned range. In relation with the detector characteristic of the IR camera it causes underestimation of the measured sky temperature. This work deals with the analysis of influence of the IR camera detector characteristic on the results of determination of sky temperature and its thermal radiation intensity.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 173-175
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Background light suppression lock-in method for multispectral measurements with near-infrared LED spotlight illumination
Autorzy:
Olbrycht, R.
Powiązania:
https://bibliotekanauki.pl/articles/114491.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
multispectral
imaging
near infrared
Opis:
The paper deals with illumination issues in multispectral imaging and presents the lock-in approach for background light suppression. There is comparison shown between the results obtained with differential approach and lock-in approach without sweep and with sweep. Obtained results prove the good performance of background suppression with the proposed lock-in approach.
Źródło:
Measurement Automation Monitoring; 2018, 64, 4; 99-102
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The infrared measurement method in the air in small closed areas
Autorzy:
Pešek, M.
Powiązania:
https://bibliotekanauki.pl/articles/402300.pdf
Data publikacji:
2013
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
temperature field
infrared camera
small closed space
transmissivity
Opis:
The article is focused on the infrared measurement method in the air in small closed areas. This method is based on the visualization of temperature fields on an auxiliary material which is inserted into the non-isothermal air flow in a research area. In small closed spaces where is impossible to put the measuring equipment due to various reasons, it is necessary to visualize the temperature fields through a window. This window must be permeable for infrared radiation of known properties, especially the transmissivity. As an auxiliary material for the visualization of temperature fields in these experiments, the ordinary office paper with high emissivity value was chosen and the viewing window was made of a polyethylene. The presented method for the measurement of temperature fields in the air can be applied mainly in closed spaces where is difficult to situate the infrared camera (due to field of view), in spaces where the infrared camera restricts the flowing air or where is aggressive or too hot environment (a potential damage of infrared camera), etc. In this article the parameter analysis, which is important for a particular application, is performed and an example of temperature fields measurement in closed space is presented. This method can be used in cooling and heating design of means of transport, mostly for cabins of cars and trucks.
Źródło:
Structure and Environment; 2013, 5, 3; 33-36
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineral preconcentration using near infrared sensor-based sorting
Autorzy:
Iyakwari, S.
Glass, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/109720.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
near infrared
copper
hematite
preconcentration
strategy
intimate mixtures
moisture
Opis:
This paper predicts qualitatively and quantitatively the near infrared activity of individual minerals in simple and complex mineral associations using mixtures of common alteration minerals found in a copper ore. It was found that spectra dominance in most cases is dependent on any or combination of mineral composition, relative proportion or concentration and/or mineral accessibility or sensitivity to near infrared radiation. The analysis of results also indicated that, in most cases, only freely occurring waste, such as clays (kaolinite and/or muscovite) and calcite, can be targeted for discrimination. In this paper, a strategy for the application of near infrared for preconcentration of copper bearing minerals like chrysocolla and malachite from coarse ore particles was proposed. Other applications also considered in this paper include preconcentration of hematite from associated clays and carbonate waste, and the determination of moisture content in kaolinitic clays.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 661-674
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of human faces in thermal infrared images
Autorzy:
Kowalski, Marcin Ł.
Grudzień, Artur
Ciurapiński, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/1849135.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal infrared
face detection
biometrics
human detection
Opis:
The presented study concerns development of a facial detection algorithm operating robustly in the thermal infrared spectrum. The paper presents a brief review of existing face detection algorithms, describes the experiment methodology and selected algorithms. For the comparative study of facial detection three methods presenting three different approaches were chosen, namely the Viola-Jones, YOLOv2 and Faster-RCNN. All these algorithms were investigated along with various configurations and parameters and evaluated using three publicly available thermal face datasets. The comparison of the original results of various experiments for the selected algorithms is presented.
Źródło:
Metrology and Measurement Systems; 2021, 28, 2; 307-321
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interferencyjne filtry blokujące promieniowanie podczerwone
Interference film of blocking the infrared radiation
Autorzy:
Gralewicz, G.
Owczarek, G.
Kubrak, J.
Powiązania:
https://bibliotekanauki.pl/articles/160205.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
optyka cienkowarstwowa
filtr interferencyjny
promieniowanie podczerwone
interference film
infrared radiation
thin film optics methods
infrared protection
eye and face protection
Opis:
W niniejszym artykule przedstawiono podstawowe informacje na temat możliwości blokady szkodliwego promieniowania podczerwonego na gorących stanowiskach pracy metodami optyki cienkowarstwowej. Obliczono i przeanalizowano konstrukcje cienkowarstwowe pod kątem efektywności blokowania szkodliwego promieniowania. Opracowano technologie wykonywania wybranych konstrukcji filtrów technikami parowania próżniowego. Ponadto porównano właściwości filtrów obecnie dostępnych z nowymi prezentowanymi rozwiązaniami.
This article presents basic information on how to block harmful infrared radiation using optical filters with thin-film coating. Interference structures for efficient blocking of harmful radiation was calculated and analyzed. The construction of new interferencje optical filters against infrared radiation was compared with currently available filters.
Źródło:
Prace Instytutu Elektrotechniki; 2012, 256; 23-34
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Image processing of leaks detection in sequence of infrared images
Autorzy:
Bukowska-Belniak, B.
Leśniak, A.
Powiązania:
https://bibliotekanauki.pl/articles/114417.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
image processing
infrared image
experimental embankment
leaks detection
Opis:
This work presents the method of leaks detection in recorded sequence of infrared images. Infrared field measurements were taken on small experimental embankment during flood process simulation. The leak processes took place thru initially dry facility. Getting wet areas were visible in infrared images as lower temperatures part of embankment on its air side. Image processing methods allowed to localize the leak in thermal images, despite the impact of external factors on the measurement and differences in objects emissivity in the observed scene.
Źródło:
Measurement Automation Monitoring; 2017, 63, 4; 131-134
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pasywne czujniki podczerwieni
Passive infrared detectors
Autorzy:
Serafin, K.
Powiązania:
https://bibliotekanauki.pl/articles/158115.pdf
Data publikacji:
1998
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Opis:
Omówiono podstawy teorii detekcji promieniowania podczerwonego ze szczególnym uwzględnieniem zjawisk występujących w detektorach piroelektrycznych. Zaprezentowano konstrukcję i zasadę działania pasywnych czujników podczerwieni. Czujniki te są szeroko stosowane w systemach sygnalizacji włamania i napadu jako detektory ruchu. Przedstawiono ideę analizy sygnału z detektora podczerwieni w specjalizowanych układach elektronicznych czujnika.
The theory infrared energy detection has been described. The attention was focused on phenomena in the pyroelectric detectors. The construction and principles of working has been presented. The infrared detectors are widely used in intruder alarm systems. The conception of infrared detector output signal analysis in application specific integrated circuits has been de scribed.
Źródło:
Pomiary Automatyka Kontrola; 1998, R. 44, nr 10, 10; 379-384
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Termografia w podczerwieni - błędy i niepewności
Infrared thermography - errors and uncertainties
Autorzy:
Minkina, W.
Dudzik, S.
Powiązania:
https://bibliotekanauki.pl/articles/157689.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
termografia w podczerwieni
błędy
niepewności
infrared thermography
errors
uncertainties
Opis:
W artykule przedstawiono zarys teorii błędów i niepewności występujących podczas bezstykowego pomiaru temperatury a pomocą kamery termowizyjnej. Wskazano na różnicę pomiędzy pojęciami błędu i niepewności. Dodatkowo przeprowadzono dyskusję źródeł powstawania błędów i niepewności w tego typu pomiarach. Zaprezentowano wyniki analizy niepewności metodą Monte Carlo dla wybranych warunków pomiaru. Treść artykułu odnosi się do monografii autorów pod tytułem: "Infrared Thermography - errors and uncertainties" będącej aktualnie w druku w wydawnictwie John Wiley & Sons.
In the paper there is presented an outline of the theory of errors and uncertainties for non-contact temperature measurements with an infrared camera. The paper begins with an introduction. In this section, the model of the infrared camera measurement path is described and a difference between the error and uncertainty concept is pointed out. The next section deals with the errors of infrared thermography measurements [1, 3]. In this section an analysis of the source of errors is conducted as well [3, 4]. The exemplary results of the error analysis regarding with the emissivity errors are shown (Figs. 1-3). In Section 3 an uncertainty analysis of the infrared thermography measurements is performed [1-3, 5-12, 14]. The exemplary results of the uncertainty analysis with the Monte Carlo simulations are presented (Figs. 5, 6). These results are obtained for the commonly occurring measurement conditions. The paper ends with conclusions. In this section the quantitative conclusions from the error and uncertainty analysis are drawn. These conclusions can be very useful for thermographers taking the infrared thermography measurements in practical situations. The contents of this paper refers to the authors' monograph entitled "Infrared Thermography - errors and uncertainties", currently printed in John Wiley & Sons.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 11, 11; 868-873
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement system for IR absorption
Układ pomiaru tłumienia promieniowania podczerwonego
Autorzy:
Neska, M.
Powiązania:
https://bibliotekanauki.pl/articles/256772.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
infrared radiation
infrared detector
measurement uncertainty
promieniowanie podczerwone
detektor podczerwieni
niepewność pomiaru
Opis:
Radiation absorption measurement systems are widely used in the evaluation of different types of materials. They require a stable transceiver radiation measuring circuit. The article presents a transceiver infrared radiation system developed by the author, in which, apart from a stabilized power supply of transmitting and receiving subsystems, the dedicated software for temperature correction of output signals was also used. The system has two measuring circuits at wavelengths of 860 nm and 950 nm. The paper presents characteristics and measurement uncertainties of the system, determined by means of the reference material. This type of a system can be used in systems for IR transmission or reflection tests, and it can be of help in radiation absorbance studies.
Układy pomiaru tłumienia promieniowania znajdują szerokie zastosowanie w ocenie różnych typów materiałów. Wymagają one stabilnego toru nadawczo-odbiorczego promieniowania. W artykule przedstawiono opracowany układ nadawczo-odbiorczy promieniowania podczerwonego, w którym obok stabilizowanych źródeł zasilania podukładów, nadawczego i odbiorczego, zastosowano programową korekcję temperaturową sygnałów wyjściowych. Układ posiada dwa tory pomiarowe o długościach fal 860 i 950 nm. W artykule zaprezentowano charakterystyki i niepewności pomiarowe układu wyznaczone przy wykorzystaniu referencyjnego materiału. Układ tego typu może być zastosowany w systemach badania przepuszczalności lub odbicia światła podczerwonego, czy badaniach absorbancji promieniowania.
Źródło:
Problemy Eksploatacji; 2015, 1; 91-100
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of performance limits of the HOT HgCdTe photodiodes with colloidal quantum dot infrared detectors
Autorzy:
Rogalski, A.
Kopytko, M.
Martyniuk, P.
Hu, W.
Powiązania:
https://bibliotekanauki.pl/articles/201444.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
colloidal quantum dot infrared photodetectors
HOT infrared detectors
HgCdTe photodiodes
p-i-n depleted photodiodes
BLIP performance
Opis:
In the past decade, there has been significant progress in development of the colloidal quantum dot (CQD) photodetectors. The QCD’s potential advantages include: cheap and easy fabrications, size-tuneable across wide infrared spectral region, and direct coating on silicon electronics for imaging, which potentially reduces array cost and offers new modifications like flexible infrared detectors. The performance of CQD high operating temperature (HOT) photodetectors is lower in comparison with detectors traditionally available on the global market (InGaAs, HgCdTe and type-II superlattices). In several papers their performance is compared with the semiempirical rule, “Rule 07” (specified in 2007) for P-on-n HgCdTe photodiodes. However, at present stage of technology, the fully-depleted background limited HgCdTe photodiodes can achieve the level of room-temperature dark current considerably lower than predicted by Rule 07. In this paper, the performance of HOT CQD photodetectors is compared with that predicted for depleted P-i-N HgCdTe photodiodes. Theoretical estimations are collated with experimental data for both HgCdTe photodiodes and CQD detectors. The presented estimates provide further encouragement for achieving low-cost and high performance MWIR and LWIR HgCdTe focal plane arrays operating in HOT conditions.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 845-855
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing coatings of reflecting infrared radiation for a target for night shooting
Autorzy:
Swiderski, Waldemar
Hłosta, Paweł
Polak, Grzegorz
Tymiński, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/114598.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermal target
infrared
emissivity
shooting
Opis:
The paper presents the principle of operation of a new night-shooting target. Because this target requires a covering that reflects the infrared radiation flux generated by the reflector from its surface, testing of different variants of the cover and the shape of the target surface has been carried out. Emissivity is a physical parameter characterizing the radiant properties of real bodies. The emissivity coefficient of extruded aluminum sheet samples covered with a layer of green colored aluminum oxide was determined. The aluminum oxide layer was applied using two different technologies being galvanic and anodizing.
Źródło:
Measurement Automation Monitoring; 2019, 65, 2; 41-43
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface treatment of GaSb and related materials for the processing of mid-infrared semiconductor devices
Autorzy:
Papis-Polakowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/378417.pdf
Data publikacji:
2006
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
Tematy:
semiconductor devices
mid-infrared wavelenth range
GaSb
Opis:
Various chemical treatments of GaSb and related compounds has been studied with the aim to develop procedures of polishing of GaSb substrates, preparation of their surfaces for deposition of metal and dielectric films, for liquid phase epitaxial growth, and finally fabrication of passivating coatings on surfaces of GaSb and its alloys. A broad spectrum of surface characterisation techniques has been used to analyse morphology of the surface and its chemical composition after each of the treatments applied. This allowed us to elaborate a complete set of technological procedures necessary for the fabrication of the efficient GaSb- based photo- and light emitting diodes operating in the midi-infrared wavelength range.
Źródło:
Electron Technology : Internet Journal; 2005-2006, 37/38, 4; 1-34
1897-2381
Pojawia się w:
Electron Technology : Internet Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infrared Detectors - New Trends
Autorzy:
Piotrowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1872382.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.-j
Opis:
Recent trends in infrared detectors are towards large, electronically addressed two-dimensional arrays and higher operating temperature. This will lead both to higher performance and to smaller, lighter and more affordable IR systems. Cooling requirements are the main obstacle to the more widespread use of infrared systems based on semiconductor photodetectors, particularly in the civil field. Fundamental limitations to performance of IR photodetectors are due to the statistical nature of generation-recombination processes and resulting noise. Ways to overcome the limitations are discussed including use of the optical immersion and optical resonant cavity. Finally, the progress in a mode of operation is presented, in which the thermal generation of carriers is suppressed by the use of stationary depletion of narrow gap semiconductors. The practical near room temperature narrow gap semiconductor photodetectors are reported. Competitive technologies based on Schottky barrier devices and low dimensional solids are considered briefly.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 303-316
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accuracy of drying selected products using a moisture analyzer method based on infrared radiation
Autorzy:
Janas, Sławomir
Kowalska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/27311743.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
moisture analyser
infrared heating
food quality
mass measurements
Opis:
Trueness and precision of a method for determining the water content (%) of food and chemical products based on infrared radiation with a wavelength in the range (2.70÷7.21 μm) was evaluated. The most accurate measurements for food products were obtained when the heat source was a radiant heater with a radiation wavelength of 7.21 μm, a trueness deviation of 0.01%. When heated with radiation with wavelengths (from 3.32 μm to 7.21 μm), the trueness of the measurement ranged (0.03%÷0.13%) for chemical products. The shortest analysis time for food products was found when the analysis was carried out using an IR source with a wavelength of 7.21 μm, while for chemical products, a heat source with a wavelength of 2.70÷7.21 μm was optimal. According to the results of the analysis, the use of IR radiation with a wavelength range of 3.32÷7.21 μm is an alternative for accurate measurements.
Źródło:
Metrology and Measurement Systems; 2023, 30, 2; 305--321
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Termowizja w ocenie jakości przegród budowlanych
Infrared method for the quality rating of building partitions
Autorzy:
Steidl, T.
Krause, P.
Powiązania:
https://bibliotekanauki.pl/articles/157649.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
termowizja
budynek
przegrody budowlane
thermography
infrared inspections
buildings
Opis:
W artykule przedstawiono zastosowanie badań termowizyjnych w ocenie jakości cieplnej przegród budowlanych. Opisano wymagania w zakresie prowadzenia pomiarów kamerą termowizyjną w budownictwie oraz główne czynniki wpływające na otrzymywane wyniki. Na praktycznych przykładach pokazano analizę badań zestawiając wyniki pomiarów termowizyjnych z obliczeniami. Dla badanych fragmentów przegród budowlanych omówiono występujące defekty i anomalie termiczne.
In the paper principles of using the infrared thermography method in building engineering are presented. The first section contains the introduction to the topic of using thermography in building engineering. Defects of building partitions which can be detected by infrared camera are described. The second section gives a short description of the factors which influence the quality of thermo-grams. According to the authors, the main factors are: infrared camera technical parameters, keeping the rules for performing investigations, knowledge of a building structure, ability of making the computer models of building partition connections which can be used to verify the investigation results. The third section presents a short overview of the investigation procedures used for taking measurements during building diagnostics. In the fourth section a way of taking the fundamental and subsidiary measurement is given. The diagnosed defects and anomalies for all partitions and connections between them are described. Several chosen thermograms made during investigations are shown in Figs. 1, 2, 4 with description of the defects. Verification of the selected ther-mograms was performed with the computer program KOBRA. In the summary some guidelines connected with the way of presenting the results of thermal diagnostics of buildings are given.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 11, 11; 942-945
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 664

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